Sverre Knut JohansenPrecambrian
1.
Hadean Eon (Earth’s Formation)
2.
Archean Eon (Life Beginning and Photosynthesis)
3.
Proterozoic Eon (Oxygen Crisis and First Snowball Earth)
4.
Paleozoic Era (Transformation - Animals and Plants Emanate onto Land)
5.
Mesozoic Era (First Mammals and Birds)
6.
Cenozoic Era (Climate changes; Homo Habilis and Evolution)
7.
Anthropocene (Humans Impact Earth’s Geology and Ecosystems)
8.
Precambrian (Earth's Geologic Time Scale Impact)
